Alkanethiol self-assembled monolayers as the dielectric of capacitors with nanoscale thickness

Physics

Scientific paper

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Capacitors, Metal-Insulator-Metal Structures, Polymers, Organic Compounds, Permittivity

Scientific paper

Alkanethiol self-assembled monolayers (SAMs) on a mercury surface are used to build a junction consisting of two opposing mercury surfaces with interposed SAMs: Hg-SAM/SAM-Hg. The liquid mercury surface provides a support for the SAM that is smooth, compliant, free of defects, and without the incommensurate lattice properties that characterize solid metal surfaces. The thickness of the dielectric (~30-90 Å) in this junction can be easily changed by using alkanethiols with different lengths. From capacitance measurements, a dielectric constant of 2.7+/-0.3 is calculated for the SAMs. The conductivity of SAMs on the Hg surface is σ=6+/-2×10-15 Ω-1 cm-1, a value close to that of bulk polyethylene. The junction sustains an electric field of 6 MV/cm.

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